Yuel's two attempted suicides take place regardless of what choices you pick, since the story doesn't banch off into the different endings until about 70% of the way through. A lot of the grim content here is unskippable, though the darkest content is in a couple of the bad endings.
If you want I can tell you all the choices you need to pick to get the good ending, if you want to ensure that things end happily.